patch 8.2.2484: Vim9: Cannot use a comment starting with #{

Problem:    Vim9: Cannot use a comment starting with #{ after an expression.
Solution:   Remove the check for "{" since #{ dictionaries are not supported.

src/testdir/test_vim9_script.vim

@@ -2205,6 +2205,10 @@ def Test_while_loop()
     result ..= cnt .. '_'
   endwhile
   assert_equal('1_3_', result)
+
+  var s = ''
+  while s == 'x' #{comment
+  endwhile
 enddef
 
 def Test_while_loop_fails()